Tire Terminology And Definitions - Chevrolet 2014 Silverado Owner's Manual

10-58 Vehicle Care
(LT-Metric) tire illustration, it
would mean that the tire's
sidewall is 75 percent as high as
it is wide.
(4) Construction Code
code is used to indicate the type
of ply construction in the tire.
The letter R means radial ply
construction; the letter D means
diagonal or bias ply
construction; and the letter B
means belted-bias ply
construction.
(5) Rim Diameter Diameter of
:
the wheel in inches.
(6) Load Range Load Range.
:
(7) Service Description
service description indicates the
load index and speed rating of a
tire. If two numbers are given as
in the example, 120/116, then
this represents the load index for
single versus dual wheel usage
(single/dual). The speed rating is
the maximum speed a tire is
certified to carry a load.
Tire Terminology and
A letter
:
Definitions
Air Pressure
air inside the tire pressing
outward on each square inch of
the tire. Air pressure is
expressed in kPa (kilopascal)
or psi (pounds per square inch).
Accessory Weight
combined weight of optional
accessories. Some examples of
optional accessories are
automatic transmission, power
The
:
windows, power seats, and air
conditioning.
Aspect Ratio
of a tire's height to its width.
The amount of
:
The
:
The relationship
:
Belt A rubber coated layer of
:
cords between the plies and the
tread. Cords may be made from
steel or other reinforcing
materials.
Bead The tire bead contains
:
steel wires wrapped by steel
cords that hold the tire onto
the rim.
Bias Ply Tire A pneumatic tire
:
in which the plies are laid at
alternate angles less than
90 degrees to the centerline of
the tread.
Cold Tire Pressure
:
amount of air pressure in a tire,
measured in kPa (kilopascal)
or psi (pounds per square inch)
before a tire has built up heat
from driving. See Tire Pressure
on page 10-61.
Curb Weight The weight of a
:
motor vehicle with standard and
optional equipment including the
The